Process of polishing smooth rolls with curved superficies



Sept. 30, 1969 A. KLEIN 3,469,353

PROCESS OF POLISHING SMOOTH ROLLS WITH CURVED SUPERFICIES Filed Aug.. 29. 1966 INVl-JVI'UR.

AR TUR KLEIN United States Patent U.S. Cl. 51-289 1 Claim ABSTRACT OF THE DISCLOSURE Curved smooth superficies of rolls are polished by polishing discs which are swung during the polishing so that their middle planes are always perpendicular to tangents to the superficies at the places of contact between the superficies and the discs.

This invention relates to a process of polishing smooth rolls with curved superficies upon roll polishing and grinding machines.

Rolls of this type are used in a variety of rolling mills, including plate rolling mills, band mills, foil mills, etc., as well as in paper making machines and calenders; these rolls bend or sag under the eifect of roll pressure. The outer surfaces of driving rolls embody convex curves as a rule, while the outer surfaces of supporting rolls embody concave curves.

Heretofore smooth rolls with curved superficies were polished by a profile polishing process, wherein an eccentric disc served, for example, as a master curve. In this prior art process the central plane of the polishing disc extends during the entire operation at a constant angle to the axis of the roll being polished. This procedure makes it necessary to provide a curve-shaped truing of the polishing disc to avoid the trimming of the edges. This curve-shaped truing diminishes the width of the engaging cutting edge of the polishing disc, so that the output of such discs is smaller than that of polishers operating with full disc width. The output of a machine which was constructed for the use of the widest discs, is utilized only to the extent of a fraction.

An object of the present invention is the provision of a process which will make it possible to polish rolls with curved superficies with the full width of the polishing disc.

Other objects will become apparent in the course of the following specification.

The objectives of the present invention are accomplished by providing a swinging of the polishing disc depending upon the feed and the shape of the superficies of the roll being polished in such manner that the middle plane of the polishing disc always extends perpendicularly to the tangent of the superficies.

FIGURES l and 2 of the attached drawing are diagrams illustrating the process of the present invention. FIG. 1 shows a roll 1 having a central axis 2 and a convex outer surface 3. A central cylindrical polishing disc 3,469,353 Patented Sept. 30, 1969 5 is located at the precise top 6 of the convex curve so that at the point of contact 7 of the circumference of the disc 5 with the outer surface 3, the tangent to the point 7 coincides with the circumference of the disc. The disc 5 can be moved out of this central location in the directions of the arrow 10 to assume the positions 5 and 5". In the course of these movements the central axis 9 of the disc is swung by any suitable means to the extent of the length 14. By Way of example, in the position 5 the longitudinal axis 4 of the disc forms an angle 12 with the vertical plane. This angle is such that the axis 4 extends at a right angle to the tangent extending from the point of contact 7 of the circumference 3 of the roll with the circumference of the polishing disc. The same conditions prevail when the polishing disc is moved in the opposite direction to the position 5" or when a roll 17 with a concavely curved outer surface is used, as shown in FIG. 2.

The advantages of this process of the present invention reside particularly in that polishing discs of any desired width can be used for the polishing of smooth rolls with curved superficies. In case of rolls having convexly curved outer surfaces, it is possible to use 'all types of cylindrically planed discs without any limitations. However, it is also possible to further increase the length of contact area between the roll and the polishing disc by adapting to each other the shapes of the outer surfaces of the roll and of the polishing disc, so that rolls with convex outer surfaces will be polished by polishing discs with concave outer surfaces, while it is necessary to use discs with convex outer surfaces to polish rolls with concave outer surfaces.

A most important advantage of the process of the present invention as compared to prior art procedures is believed to consist in that the use of the entire output for which a roll polishing machine has been constructed and the use of the entire width of discs has decisively reduced the time necessary for the polishing of smooth rolls with curved superficies.

What is claimed is:

1. A process of polishing smooth rolls with curved superficies of rolls, said process comprising maintaining the outer polishing surface of a polishing disc in engagement with an outer curved surface of the roll being polished so that the middle plane of said disc will be perpendicular to the tangent at the point of engagement of the disc with the roll and swinging said disc when applying it to another part of said curved surface having a different curvature to maintain said middle plane perpendicularly to the tangent at said other part.

References Cited UNITED STATES PATENTS LESTER M. SWINGLE, Primary Examiner U.S. C1.X.R. 51-49 

